Point sets and cultural / custom shape points are imported from plain delimited text (CSV / TAB / .txt) using the shared column-mapping wizard. The Import seismic events from ASCII... command uses that wizard to create a seismic-event point set.

Purpose

Load scattered point data - point sets, cultural points or custom shape points - from a text file into the project. Map two numeric file columns to X and Y; map other columns to attributes as needed.

Launching the import

In the Data manager, right-click Points or a user folder within it. Choose Import from ASCII... for a general point set or Import seismic events from ASCII... for an event catalogue, then select the text file. For cultural / custom shape points, use the cultural data node.

Step-by-step

1. Right-click Points in the Data manager and choose Import from ASCII... or Import seismic events from ASCII..., according to the data you are importing.
2. Select the delimited text file (CSV / TAB / TXT).
3. In the column-mapping wizard, set the separator, header row and start row, then map columns to X, Y and the attribute fields.

   

4. Check the parsed preview - fields with the wrong type are highlighted - then confirm to load the points.

Seismic event catalogues

The seismic-event import requires numeric X and Y. Map any available Event ID, Z, MD, TVD, TVDSS, Strike, Dip, Rake, Time, Magnitude, Stage, Well, Quality and Formation columns. The wizard also accepts the moment-tensor components Mxx, Myy, Mzz, Mxy, Mxz and Myz. Fields not mapped from the file remain absent.

Choose the file's coordinate system and measurement units in the wizard. Imported X and Y coordinates are transformed for the project; Z, MD, TVD and TVDSS values are converted to project depth units. When present, Z becomes the depth display attribute and Magnitude the value attribute. Strike, Dip and Rake use degree units. MD, TVD and TVDSS remain separate well-depth attributes; Z is not treated as a well depth.

The imported point set appears under Points > Seismic Events, and one set can contain events from several wells. To calculate a mechanism from interpreted Strike, Dip and Rake values, see Focal Mechanism.

To view the imported events, open the Location map, enable the dataset in the tree and fit the view to the event extent. Increase the point size if needed to make the events readable.

Notes

• The same column-mapping wizard is used for well headers, markers, inclinometry and other ASCII imports; only the target object type differs.
• Cultural / custom shape points use the same text layout and are loaded the same way.

See Also

Point Data Formats | Export points | GIS Data Formats